Maintenance
146 RTAC-SVX01J-EN
simply replace the oil that was removed into the serviced
component prior to vacuum and recharge of the
refrigerant.
If oil was removed from the compressor only to
service a compressor or change the oil filter follow
this procedure:
1. If the compressor is a new compressor or has been
removed from the system and reworked, add 1 quart (2
lb.) oil to the motor cavity prior to installing the
compressor into the chiller.
2. Install the compressor in the system. Make sure that
the filter shut off valve is closed. Other compressor
isolation valves may also be closed depending upon
the service that was completed. For example, changing
the oil filter would require the compressor to be
isolated and pulled into vacuum.
Note: Make sure that compressor is not pressurized.
3. Open the flare fitting on the oil line shut off valve.
4. Open the flare fitting on the filter housing. This is the
port that must be used to put oil into the compressor.
5. Install charging hose on oil charging port (with
schrader valve) and the other on the oil canister.
6. Lift the oil canister, or use a pump, to pour oil into the
filter housing.
7. When oil comes out of the flare fitting on the oil line
shut off valve the filter is full. Stop adding oil.
8. Put the cap on the flare on the oil line shut off valve,
remove the charging hose and put the cap back on the
flare on the filter housing.
9. Vacuum the compressor (low side) and prepare it for
inclusion in the system.There is a service valve on the
suction line and on the evaporator. Use these valves to
vacuum the compressor.
10. Open the oil line shut off valve. Severe damage to the
compressor can result if the oil line shut off valve is
closed when the compressor is started.
11. Open the other compressor isolation valves.
Note: This procedure assumes that the oil that is put into
the filter housing does not have contaminants such
as non-condensable gases.The oil forces these
gases out of the filter and oil line shut off valve
without the need to pull a vacuum on this small
volume. If the oil has been in an open container or
is otherwise contaminated, then this small volume
must be subject to vacuum as well. However, the
filter cavity is full of oil.Therefore, be sure to use a
flash tank in line with the vacuum pump to make
sure that oil, that is pulled out of the filter cavity,
does not slug the vacuum pump.
Evaporator tube replacement
The units were designed for installation of the tubes from
the end of the evaporator opposite the control panel end.
The following units will need to have the circuit 2 control
panel removed to replace tubes in the evaporator.
• 30' Base - 3 compressor units
• 36' Base - 3 compressor units
• 45’ Base - 4 compressor units
Compressor Replacement
If a compressor needs to be replaced follow the
procedures listed below.
1. Isolate the refrigerant charge outside of the
compressor and close all four valves leading to the
compressor.This includes the oil line service valve
located on the oil filter cover of the compressor, the
valve on the oil return line from the evaporator, the
discharge service valve, and the suction service valve.
In the event that the optional suction service valve was
not ordered with the unit, insure that the liquid line
service valve is closed.
2. Disconnect power to the chiller. Remove the electrical
junction box cover and disconnect the wires.
3. Evacuate the compressor through the service fitting
provided. If the unit does not have suction service
valves, this will include evacuating the low side of the
system as well. Disconnect all four lines attached to the
compressor, as well as the junction box. Remove three
screws from the bottom of the compressor.
4. Remove the compressor by sliding it out of the chiller
onto a well supported skid or other platform.The
NOTICE:
Compressor Damage!
Catastrophic damage to the compressor will occur if
the oil line shut off valve or the isolation valves are left
closed on unit start-up.
NOTICE:
Equipment Damage!
The tubes are rolled at both ends and in the center.
When replacing tubes, take care to ensure that the tube
is removed and rolled into the center tube sheet
properly. Failure to do so could result in damage to the
tubes and improper operation of the system.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
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